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How do you add swap to an EC2 instance?
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That dd command line means "copy from /dev/zero to /var/swap.1. Do that by reading 1024 blocks of size 1 megabyte". It's a quick way to create a 1GB file full of zeroes.
– Nelson
Jan 21 '15 at 4:43
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Add leading zeroes/0's to existing Excel values to certain length
...uestions and quality answers on SO regarding how to prevent leading zeroes from getting stripped when importing to or exporting from Excel. However, I already have a spreadsheet that has values in it that were truncated as numbers when, in fact, they should have been handled as strings. I need to ...
Octave-Gnuplot-AquaTerm error: set terminal aqua enhanced title “Figure 1”…unknown terminal type"
...charts, and reading up the answer with octaverc, I've got plotting to work from Octave-cli by adding a line with setenv("GNUTERM","qt") to /usr/local/octave/3.8.0/share/octave/site/m/startup/octaverc
I didn't have to re-install gnuplot or other dependencies.
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Convert RGBA PNG to RGB with PIL
... I found while building RGBA -> JPG + BG support for sorl thumbnails.
from PIL import Image
png = Image.open(object.logo.path)
png.load() # required for png.split()
background = Image.new("RGB", png.size, (255, 255, 255))
background.paste(png, mask=png.split()[3]) # 3 is the alpha channel
ba...
How to read/write from/to file using Go?
...ve been trying to learn Go on my own, but I've been stumped on trying read from and write to ordinary files.
8 Answers
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What is the difference between char s[] and char *s?
...ill probably be stored within an "initialised data segment" that is loaded from the executable file into writeable memory when the program is run.
On the other hand, this declaration:
char *s ="hello";
Creates two objects:
a read-only array of 6 chars containing the values 'h', 'e', 'l', 'l', ...
What's the difference between git clone --mirror and git clone --bare
...ans everything: remote-tracking branches, notes, refs/originals/* (backups from filter-branch). The cloned repo has it all. It's also set up so that a remote update will re-fetch everything from the origin (overwriting the copied refs). The idea is really to mirror the repository, to have a total co...
How does lucene index documents?
... system himself. Note that by using Skip-Lists, the index can be traversed from one hit to another, making things like set and, particularly, range queries possible (much like B-Trees). And the Wikipedia entry on indexing Skip-Lists also explains why Lucene's Skip-List implementation is called a mul...
Download multiple files with a single action
...part message format. But browsers don't portably parse multipart responses from the server side, but technically there's nothing difficult with doing this.
– CMCDragonkai
Jul 27 '18 at 4:25
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Convert decimal to binary in python [duplicate]
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You can also use a function from the numpy module
from numpy import binary_repr
which can also handle leading zeros:
Definition: binary_repr(num, width=None)
Docstring:
Return the binary representation of the input number as a string.
T...